earticle

영어

This study aims to evaluate the applicability and optimal conditions of fiber laser cleaning for safely removing urethane paint layers from fiber-reinforced plastic (FRP) sculptures without damaging the substrate. Test specimens were fabricated to replicate the coating structure of actual artwork s, w ith v ariations i n color (black, white, r ed, indigo, yellow), t hick ness ( 100 a nd 2 00 μm), laser output, and number of irradiations. Thermogravimetric analysis determined the glass-transition temperature (39.2°C) and pyrolysis temperature (392.1°C) of FRP, establishing a safe irradiation range. Surface temperature changes were monitored using infrared thermometry under varying conditions, while coating removal and layer-by-layer tendencies were examined via digital microscopy. Results showed gradual removal of layers (base coat, primer, and substrate interface) depending on conditions. Highest efficiency without substrate damage was achieved with condition A and three irradiations for black specimens (due to high endothermic properties) and condition C and three irradiations for other colors. Removal efficiency decreased with increasing coating thickness under identical conditions. This study provides fundamental data for optimizing laser cleaning tailored to the material, color, and coating structure of synthetic resin artworks, with potential expansion to conserving modern composite-material artworks. This study evaluates the applicability and optimal conditions of fiber laser cleaning for safely removing urethane paint layers from fiber-reinforced plastic (FRP) sculptures. Test specimens, fabricated using FRP substrates coated with urethane paint in various colors and thicknesses, replicated the coating structure of actual artworks. Experimental conditions varied by laser output and number of repetitions. Thermal behavior and layer-specific removal characteristics were analyzed via thermogravimetric analysis, infrared thermometry, and digital microscopy. Results confirmed selective removal of coating layers under appropriate laser conditions without substrate damage. This study provides fundamental data for establishing laser cleaning standards for modern synthetic resin sculptures.